DACBBA-LHN Counterbalance Valve

DESCRIPTION

Fixed-setting, 3-port Counter Balance Valves with pilot assist function similarly to the adjustable versions except the fixed setting is pre-set to a nominal value.

OPERATION

The check valve allows free flow from the directional valve (port 2 ) to the load (port 1 ) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 1 . Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio.

FEATURES

● Counter Balance Valves should be set at least 1.3 times the
   maximum load induced pressure.
● Back pressure at port 2 adds to the effective relief setting at a
   ratio of 1 plus the pilot ratio times the back pressure.
● Reseat exceeds 85% of set pressure when valve is standard set.
   Settings lower than the standard pressure may result in lower
   reseat percentage.

RATINGS

Restrictive valves have no relief capacity other than as a thermal relief.Maximum setting = 280 bar.280bar Maximum recommended load pressure at maximum setting = 215 bar
Flow Rating：See Performance Chart
Internal Leakage:0.4ml/min max. to 85% of nominal setting.
Setting Pressure Defined: bar (psi) evident at 7.6 lpm (2.0 gpm) attained
Pilot Ratio:3：1Maximum setting pressure should be 1.3 times the maximum load induced pressure.
Temperature:-40℃ to 120℃，with standard Buna seals;
Fluids:Mineral-based or synthetics with lubricating properties at viscosities of 7.4 to 420 cSt (50 to 2000 sus)
Standard Ported Body：Steel rated at 420 bar（6090）.

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